Since I no longer have a 'day job' and don't need to cycle the ten mile round trip to work at the Aerospace giant that employed me, I have, mostly against my will, taken up voluntary exercise.
We've moved opposite a park, so on mornings when I can think of no valid excuse not to I run one circuit of it. I read somewhere that short vigorous exercise is as effective as long less vigorous exercise. And since it's very boring I've opted for short. Bollocks to jogging - I'm going to run.
It so happens that my circuit is almost exactly 1 kilometer. I'm also homing (very slowly) in on breaking the 4 minute barrier ... which if it were 1 mile instead would be impressive.
To put it in context, the world record for the 1k is just over 2 minutes!
But I'm an old man, and unfit, and genetically unfit as well (as a young man when I tried running the 5 mile circuit they used to put us on at school I would always end up coming midfield in a class where most of them had opted to make a stroll of it). My heart/lungs are just not very well wired for running.
Anyway, this is what you've made me do by sitting me in front of a writer's desk. For shame!